Feed and rapid traverse mechanism



p 1942 w. F. GROENE EI'AL 2,295,079

FEED AND RAPID TRAVERSE MECHANISM -Filed Sept. 28, 1940 6 Sheets-Sheet 2INVENTOR wn um emoaua GEORGE. \N. \.UN\NC Sept. 8, 1942.

W. F. GROENE ETAL FEED AND RAPID TRAVERSE MECHANISM Filed Sept. 28, 19406 Shets-Sheet 3 INVENTORS.

wn.um F. GROENE GEORGE \N.LUN\NG Sept. 8, 1942. w 5 GROENE r AL 2,295079FEED AND RAP ID TRAVERSE MECHANISM Filed Sept. 28, 1940 6 Sheets-Sheet 4INVENTORS. w1u.mm F. GROENE.

BY GEORGE. w.ummq

S ept. 8, 1942. w. F. GROENE ETAL 2295079 FEED AND RAPID TRAVERSEMECHANISM Filed Sept. 28, 1940 6 Sheets-Sheet 5 INVENTRSGE.QRGE.W.LUN\NG Sept 8, 1942. w. F. GROENE ET AL FEED AND RAPIDTRAVERSE MECHANISM Filed Sept. 28, 1940 6 Sheets-Sheet 6 Patented Sept.8, 1942 U'ED STATES PATENT GFFICE FEED AND RAPID TRAVERSE MECHANISMWilliam F. Groene and George W. Luning, Cincinnati, Ohio, assignors toThe R. K.Le Blond Machine Tool Company, Cinoinnati, Ohio, a eorporationof Delaware Application September28,l940, Serial No. 358,872

2 Claims. (01. 82-121) In such types of 1athes it is especiallyimpertant te be able te rapidly convert the movement of the boring barholding member rom rapid traverse te slew speed movement and vice versate eect the most eflicient boring and cutting actien of the boring teelin the werk te be bered. Ceup1ed with this desired nicety of eentre1 isthe problem of relatively long distance of feed and rapid traversetravel which is inherent in such type of tube er gun boring lathes andit is desirable te be able to at any time througheut this extendedtravel at feed er rapid traverse,

te be able te accurately step either of the metions of feed and rapidtraverse withinclose limts and with a smeothness of operatien which willprevent damage to the cutting teel and. to" the tubular werk beingbered.

T0 this end, we have previded a unique feeding arrangement fer specificapplication te the difiicult preblem of rapid traversing and feeding theboring bar helder of such lathes in which change frem feed te rapidtraverse er rem rapidtraverse te feed efifected in a smooth and eficientmanner while previding the desirable necessary mechanical screw eedactuation te the boring bar helder.

Anothe object of this invention is te provide in cenjunction with thefeed drive mechanism, suitable change speed gearing giving apredetermined fixed rate of eed movement of the boring bar helderrelative te the spindle rotation of the machine which may be reiativelyselectable fer the desired material and type of boring operatien te beundertaken and it is also a feature of this invention, te incorperate inconjunctien with this mechanism, a reversing mechanism, so that thefeeding operatien may take place in either directien.

In cenjunctien with such feeding mechansm, it is our purpose te have arapid traversingmotor positively connected te the feeding mechanism atall times and energizable for effecting rapid traversing of the boringbar helder, while the eedng mechanism is disconnected momentarily fromthe screw actuating mechanism fer the i helder,

And it is a1soan ebjetef this invention, te utilize, in cenjunction withthe selectable feeding mechanism, a clutching device whereby when therapid traverse power is instantly cut off,the feed maybe instantlyengaged te instantly arrest rapid traverse movement of the boring barfeeding device and immediately cause the feeding power te be tlansmittedto the 'screw actuating mechanism for the boring bar helder.

Further. features and advantages of this invention will appear from thedetaileddesriptien of the drawings in which:

Figure I is a front perspective view of atypical gun boring 1atheshewing my inventien applied thereto.

Figure II is a rearperspective view of the gun boring lathe of Figure I.

Figure III is a fragmentary diagrammatic section through the feed and.rapidtraversemechanism of the iathe of Figures I and II, shoWn en theline IIIIII of Figures IV, V and VI.

Figure IV is aleft hand end elevation of the machine of Figures 1 andII, shown particularly by the line IVIV in Figures III and VII.

Figure V is a transverse section through the gun boring lathe en theline V-V of Fgure III.

Figure VI is a transverse section through the machine en the line VIVIof Figures III and VI.

Figure VII is a rear view, partly breken away -in sectien, en the lineVIIVII of Figures IV, V, and VI, particularly shewing the rear Dertienof the feed and rapid traverse mechanism of Figurell.

Noting particularly Figures I and II, eurinvention is shewnapplied te atypical mechamcal screw feed gun boring er tube boring lathe having abed I, which issupported en the legs2, 3,4 and 5 and en top of which ismeunted; in fixed positien, the center drive headsteck 6, having a,suitable retatable hollew werk spindle 1 en each end of which arecarried the chucks 8 and 9 which grip the tubular member te be bered.

S1idab1y mounteden the ways I and I! efthe bed I, is the boring barfeeding carrier l2 which is actuated lengitudinally of the bed infeeding er rapid traverse mevements by the unique -apparatus whichconStitutes the patentable subject matter in this applicatien. 'Ihisboring bar feedingmember |2 carries the usual boring bar l3, whichpasses threugh the supperting members 14 and 15 as is custemary in thesetypes of machines, while thebaris operatingin the bore eij the workpiece chucked in the chucking devices 8 and 9 of the headstook 6.

Noting particularly Figure VI, on the bottom of the boring bar eedingmember 12, is fixed a halfnut [6, having a semi-circular threadedportion 6a which engages in the feed and rapid traverse actuating screwl1, which is located centrally of the bed 1 of the machine and isappropriately journaled in suitable bearings at either end of the bed.At the left hand end of the bed, Figure III, it is supported on thebearings |8 carried in the bracket I9, fixed to this 1eft hand end ofthe bed by suitable screvv 20. In this was, rotation of the screw atslow or rapid rates efects the relative eeding and rapid. traversingmovement of the boring bar eeding device 12.

Power or actuating the sorew l1 at rapid traverse speeds, in eitherdirection, is effeoted by appropriately energizing the rapid traverseelectrio motor 2I which is mounted on the projecting integral portion 2aof the leg 2, the motor having a pinion 22 appropriately fixed on itsshaft 23, which drives the combined feed and rapid traverse transmissiongear 24 which is fixed on the feed clutch shaft 25 suitably journaled inbearings 26, 21, and 28 in the leg 2. The gear 24 in turn is oonnectedto the idler gear 29 journaled on a stud 30 fixed in the braoket 19,which id1er gear engages the gear 31 fixed on the outer end of the sorewl1, so as to positively rotate it When it is rotated in either directionby the rapid traverse motor 21.

Power for rotating the sorew I1 at feeding speeds in predeterminedrelationship to spindle rotation, is derived from the feed output shaft32 of the headstock 6, which is connected by the usual gearing (notshown) in the headstock 2; to rotate at all times in fixed predeterminedrelationship to the rotation of the spindle 1 of the headstook driven bythe same drive motor 1a. On the end of this shaft 32 is provided asprocket 33 over which operates the feed chain 34, which passes over asprocket 35, fixed on a shaft 36 suitably journaled in the adjustablebracket 31 carried on suitable trunnions 38 which are carried on thesupports 39 bolted to the leg 2 by suitable screws 40 and to which thebrackets 31 may be secure1y clamped by the screvvs 41. On the other endof this shaft 36 is fixed a sprocket 42 over which passes the drivingchain 43 which in turn passes over a sprocket 44 fixed on the inputshaft 45 of a conventional lathe quiok ohange or feed box 46 of a type,for example, as shown in Patent Number 980,973 of R. K. Le Blond, et2.1., issued January 10, 1911.

This feed box 46 has the usual control handles 41 and 48 for effectingthe desired selection of specific rates of feeds for the boring barfeeding member |2 as is oustomary in a 1athe. The output shaft 49 ofthis feed box 46, is connected to the input shaft 50 of the coarse feedchange and reversing gear box 51, a1so mounted on the front of the leg2. This gear box 51 is construeted as follows: The shaft 50 is journaledin suitable bearings 52 and 53 in the box I and has journa1ed on itssmaller hearing portion 50a, a compound gear 54 comprsing the gears 55and 56. A1so a shiftable gear 51 is slidably mounted in driving re1ationon this shaft 50. A second intermediate shaft 58 is similarly journaledin bearings 59 and 60 in the box 5I. On this shaft 58 is fixed thedouble gear 6I eomprising the gears 62 and 63 and also fixed on theshaft -and forming part of the hearing 60 is the pinion 64. Adjacentthis pinion 64 is the compound gear 65 comprising the gear 66 and 61.The pinion 64 is at all times in driving engagement with the gear 55 ofthe compound gear 54, while the gear 66 of the compound gear 65 is atall times in driving engagement with the gear 56 of this compound gear54.

Associated with these shafts 50 and 58 is the output shaft 68 which isappropriately journaled in hearing 69 and 10 in the gear box 51. On thisshaft 68 is journaled the gear H which is at all times in drivingengagement with the gear 63 of the double gear 6I. A1so on this shaft isjournaled the gear 12 which is arranged at all times in drivingengagement with the gear 61 of the compound gear 65. Each of these gears1I and 12 are provided with respectively internal clutch gear teeth 13and 14, which may be respectively engaged by the clutch teeth 15 of thegear 16 of the sliding sleeve gear 11 shiftably mounted in drivingrelation on the shaft 68. The usual control handle 18 is provided forefiecting the shifting engagement of the gear 11 to effect the clutchingof the clutch members 13 and 15 or the gear 16 with the clutch teeth 14of the gear 12 by manipulation of the control handle 18, Figure 1. Thegear 51 may similarly be shifted on its shaft 50 by a lever 19 in theusual manner for such levers, so that it may be respectively engagedeither with the gear 62 of the double gear 6I or directly with the gear11 on the shaft 68, so as to provide a reversal of drive between thegear 51 and the gear 1I.

By thus shifting the gear 51 by means of the lever 19, reversal of driveis effected between the shaft 50 and the shaft 68. When the gear 51 isshifted to the left in mesh with the gear 1I, o bviously the shaft 68wi11 rotate in the opposite direction from that of the shaft 50. NowWhen the gear 51 is shifted to the right in engagement with the gear 62of the double gear 61 on the shaft 58, the result will be that the gear1l will be rotated in the same direction as the shaft 50. Driving actionfrom the shaft 50 to the shaft 68 may be thus effected in two directionsand also at two different rates of speeds. For example, one rate ofspeed is effected by having the sleeve gear 11 shifted to the left withits clutch member 15 in engagement with the clutch member 13 of the gearU in which the drive in one direction may be from the shaft 50 throughthe gear 51 to the gear 1I and thereby directly to the shaft 68 havingin this construction a 1 to 1 drive between the shaft 50 and the shaft68, both shafts rotating at the same speed and of course, the reversecondition with the clutch member 15 and 13 in engagement is accomplishedby shifting the gear 51 into engagement with the gear 62 as described.

Another difierenoe in relative speed between the shaft 50 and the shaft68, in which the shait 68 is rotated at a much lower speed, is thateiected When the gear 16 is shifted into the clutch member 14 and thegear 12', in which case, in one instance, the drive from the shaft 50with the gear 51 shifted into the gear 1I takes place through the gears51 and 1! to the gear 63 of the double gear 6l' which being fixed on theshaft 58 drives this shaft, causing the pinion 64 fixed thereon to drivethe respective gear 55 and 56 of the compound gear 54 which in turndrives the gear 66 of the compound gear 65 which with its gear 61 inturn driving the gear 12 and. has the gear 16 fixed on the shaft 68. Nowin effecting this reduction drive to the gears just described but in theopposite direction, gear 51 is shifted into engagement with the gear 62in which case the shaft 58 is then driven from the gear 57 and gear 62of the compound gear 61 and thereby effecting the reversal of drive tothe shaft 53 relative to the shaft 50 and to the respective compoundgears 54 and 65 to the gears 12 as already described, so as to effectthe reverse driving action at this reduced gear ratio. Thus the gear 11on the output shaft 68 of this box is capable of being driven at twodifferent speeds and. also in both directions by the appropriatemanipulation of the 1evers 18 and '19.

This pinion '16 is arranged to drive the large c1utch gear 'l'la whichgear is suitably journaled on a hearing 18a on the drive shaft 25.Suitable c1utch mechanism indicated generally at 19a and adapted to beoperated by the c1utch aotuating spoo1 811 operated by a suitab1e clutchshifting yoke 8| carried on the shafts 82 and 83 appropriately journaledin the leg 2 of the lathe, serves to connect or disconnect the gear 11in driving relation with the shaft 25. The actuation of this clutchspool 85 for eiecting this engagement or disengagement of the drivingrelation of the gear 71 on the shaft 25 is eected by means of a pair ofsolenoids 84 and 85, Figures VI and VII, which are connected by suitablelinkage 65 and 8! re spectively to the lever 88 which is fixed on thestub shaft 83 so that it may be rocked to effect rocking of the yoke 8!and thereby effect engagement and disengagement of the clutch device 19.

The operation of this device is carried on by the usual conventionalelectrical contro1 apparatus (not shown) for the rapid traverse motor 2!and the solenoids 8 1 and 85 that when the rapid traverse motor 21 isbeing energized for rapid rotation of the screw I'f to effect rapidtraversing movement in the boring bar holder I2 the solenoids 84 will beactuated so as to release the clutch 79a to permit free rotation of thegear T| relative to the shaft 25. Under these conditions the shaft 25 ismerely being driven id1y by the gear 24 connected to the motor pinion 22while the screw I? is being rotated by the associated gearing 29 and 31as described. However, when it is desired to stop the traverse motionthe electrical energy is instantly cut off from the motor 2I while thesolenoid 85 is simultaneously instant1y energized, whereupon the clutchmember 19 is rendered eiective to instantly c1utch the gear 11 to theshaft 25, the result of whioh simultaneous operation results in theinstant stopping of the momentum in the motor 2! and associated gearingto the screw l'l so that the rapid traverse is instantly and accuratelybrought to a stop, while the feeding may be continuing under theinfluence of the drive from the headstock shaft 32 and sprocket 33, asdescribed. Since this relative feeding motion is very s1ow and since thegear ratio between the gear 11 and the sprocket 33 through thetransmission and feed boxes 45 and 51 described is very large momentumbuilt up during the rapid traverse motion does not cause any driving ofthis feeding transmission. During the driving of the shaft 25 by thefeeding motion from the sprocket 33 of the headstock, the motor 21 ofcourse, is s1ow1y being rotated idly by the gear 24 on the shaft 25.

When it is again desired to instantly engage the rapid traverse, thesolen0id 84 is then instantly energized simultaneously with theenergizing of the motor 2! so that the motor may immediately have freeaccess to the driving power to the screw l'l without the interference ordrag whioh might be imposed by the feeding transmission mechanism fromthe sprocket 33 of the headstock.

Also in conjunction with the arrangement of feed and rapid traversemechanism is provided a conventional feed box 46 in the feedingtransmission whioh permits careful and accurate quick selection of speedchanges in conjunction with the rapid traverse mechanism associatedtherewith. Also in conjunction with this feed and rapid traversearrangement is provided means for reversing the feeding driving powerwithout affeoting th rapid traversing mechanism and also to provide inconjunction with the reversing mechanism, means for effecting aplurality of diierent speeds in conjunction with this reversingmechanism.

Having thus fully set forth and described our invention what we claim asnew and desire to secure by United States Letters Patent is:

1. In a boring lathe, a longitudinally extending bed, a headstockmounted on said bed, a rotatable work spindle in said headstock, aboring bar aotuating device slidably mounted for longitudinal movementon said bed relative to said headstoek, a rotatable screw mountedlongitudinaliy of said bed, means interconnecting said boring baractuating device and said screw whereby rotation of said screw effectslongitudinal movement of said aotuating device, an electric motorocnnected to said screw, means ior energizing said motor to effect itsrotation in either direction for rapidly rotating said screw to rapidtraverse said boring bar actuating device, a quick change feed boxdriven from the headstock of said lathe, a coarse speed feed change boxdriven from said quick change feed box, and clutch means for connectingor disconnecting said coarse speed feed change box relative to saidscrew.

2. In a boring 1athe, a longitudinally extending bed, a headstockmounted on said bed, a rotatable work spindle in said headstock, aboring bar actuating device slidably mounted for longitudinal movementon said bed relative to said headstock, a rotatable screw mountedlongitudinally of said bed, means interconnecting said boring baractuating device and said screw whereby rotation of said screw eieotslongitudina1 movement of said actuating device, an electric motorconneoted to said screw, means for energizing said motor to effect itsrotation in either direction or rapidly rotating said screw to rapidtraverse said boring bar actuating device, a quick change feed boxdriven from the headstock of said 1athe, a coarse speed 'eed change boxdriven from said quick change feed box, reversing gearing in said coarsespeed feed change box, and c1utch means for connecting or disconnectingsaid coarse speed feed change box relative to said screw.

WILLIAM F. GROENE. GEORGE W. LUNING,

